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LOS ANGELES (AP) — Los Angeles police say two reputed gang members have been arrested for the Halloween killing of a 5-year-old who was shot in the head as he showed off his Spider-Man costume in his backyard.

Eighteen-year-old Marcus Denson was arrested Thursday on suspicion of murder and 21-year-old Leonard Hall Jr. was arrested before dawn Friday. Both remain jailed.

Capt. Dennis Kato says it’s believed Hall pulled a handgun and fired through a chain-link fence into the yard where Aaron Shannon Jr. was posing for photos in his costume. His uncle and grandfather were wounded.

Police have said the men may have wrongly believed gang rivals lived at the home.

Kato says a reward offer produced witness tips and a videotape of two men running from the scene also helped pinpoint the suspects.